Cohen Noel L
Department of Otolaryngology, New York University School of Medicine, New York, NY, USA.
Neurosurg Clin N Am. 2008 Apr;19(2):239-50, vi. doi: 10.1016/j.nec.2008.02.006.
The retrosigmoid technique has evolved from the traditional suboccipital operation and, when combined with removal of the posterior wall of the internal auditory canal (IAC), affords a wide exposure of the cerebellopontine angle. This approach may be used for acoustic neuromas of all sizes, from intracanalicular, to more than 4 cm from the porus acusticus. Hearing preservation may be attempted and is generally successful in a substantial minority of cases. The facial nerve is readily visualized at the lateral end of the IAC and is at no greater risk than in the translabyrinthine operation. The authors use this approach for all hearing preservation surgery as well as for tumors of more than 3 cm, regardless of hearing.
乙状窦后入路技术是从传统枕下手术发展而来的，当与内耳道后壁切除相结合时，可提供对桥小脑角的广泛暴露。这种入路可用于各种大小的听神经瘤，从内耳道内的，到距内耳道开口超过4厘米的。可尝试保留听力，并且在相当一部分病例中通常是成功的。面神经在内耳道外侧端很容易看到，其风险并不比经迷路手术更大。作者将这种入路用于所有保留听力的手术以及直径超过3厘米的肿瘤，无论听力情况如何。
